11. The test solution contains a complex compound - the product of the corresponding photometric reaction of the metal cation being determined with an organic reagent. Using the basic law of light absorption, use the data below to calculate the molar light absorption coefficient of this complex compound in solution in terms of the metal cation.

Cation Reagent Product
reaction length
waves,
nm Cation concentration in solution Layer thickness, cm Optical density
solution
Ni2 dimethylglyoxime, Br2 (NH3, pH= 9) NiL3 in H2O 445 1.50 μg/ml 1.00 0.390

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